About the Reactive Programming with Kotlin category

📚 Official Books Reactive Programming with Kotlin
1

This is the official forum for our book, Reactive Programming with Kotlin, available here: https://store.raywenderlich.com/products/reactive-programming-with-kotlin

2

Hi. When will be released the updated version of the book? Thanks

3

I have a question on the solution given for the challenge in chapter 9. The code given is

val observable = source.scan(0 to 0) { acc, current ->
  current to acc.second + current
}

The type of source is Observable<Int>.
The type of the initial value passed to scan is Pair<Int, Int>.
The type of scan’s first argument is BiFunction<T, T, T> (T being Int in this case)

So I’m surprised that this actually compiles, because the type of the initial value differs from the type of the observable’s items. Now that I’m asking, I realise the Pair is probably being implicitly destructured :slight_smile:. Is that correct?